Turning machine for machining crankshafts

Abstract

A crankshaft turning machine operating on the dual cam principle, in which the gyro cutterhead (51) is carried in an internal eccentric cam (11) and the latter in an external eccentric cam (15) rotatable in a housing, both cams being adjustable as to their mutual position. For purposes of avoiding the creation of flattened portions at the crankpins to be machined at the transition from the plunge cut to the circular feed, the design is such that the transition from the plunge cut turning process to the circular feed turning process takes place without any feed stop phase.

I claim: 
     
       1. A milling head drive for a crankshaft milling machine comprising: (A) a housing;   (B) an external cam rotatably mounted in said housing;   (C) an internal cam rotatably mounted in said housing and located within said external cam;   (D) an eccentric wheel carried in said internal cam for milling a crankshaft;   (E) motor means mounted on said housing;   (F) coupling means connected to said motor means for coupling said motor means to said cams, said coupling means including (1) an external shaft rotatably mounted in said housing and connected to said internal cam,   (2) a coupling gear fixedly mounted on said external shaft and connected to said motor means for rotating said external shaft,   (3) a clutch sleeve mounted on said external shaft to be movable axially of said external shaft and having a bolt fixed thereto and extending through said coupling gear for transmitting rotation of said motor means,   (4) moving means mounted on said housing for moving said clutch sleeve axially of said external shaft,   (5) an internal shaft rotatably mounted in said housing and connected to said external cam,   (6) a driver means mounted on said internal shaft and having a face surface facing said bolt to be contacted by said bolt when said clutch sleeve is moved axially of said external shaft toward said driver means, said face surface having an opening defined therein at a preselected location and a ramp means associated with said opening for connecting said face surface with said opening, said driver means including an abutment wall defining one wall of said opening, and   (7) said moving means moving said bolt into contact with said face surface to engage said abutment wall when said preselected location is adjacent to said bolt for coupling said internal and external cams together via said external shaft, said clutch sleeve, said bolt, said driver means abutment wall and said internal shaft and coupling said cams to said motor means via said coupling gear and said bolt.     
     
     
       2. A drive according to claim 1, wherein said opening is an opening extending parallel to the axial direction of said bolt. 
     
     
       3. A drive according to claim 1, further comprising a gear wheel meshing with said driver means and mounted on said internal shaft. 
     
     
       4. A drive according to claim 3, further including a braking clutch cooperating with said gear wheel. 
     
     
       5. A drive according to claim 4, wherein said friction clutch has a thimble, and further including a longitudinally movable element having a collar thereon; said friction clutch gripping said element via said thimble and said collar, a hydraulic cylinder for actuating said element, and a compression spring engaging said collar, upon actuation of said hydraulic cylinder said element releasing said gear wheel from engagement with said driver means against the action of said compression spring. 
     
     
       6. A drive according to claim 4, further including means for guiding said internal shaft in said external shaft. 
     
     
       7. A drive according to claim 1, comprising a gear wheel drivingly connected with said internal cam, a crown gear with internal teeth meshing with said gear wheel and with external teeth meshing with a gear wheel mounted on a hollow shaft. 
     
     
       8. A drive according to claim 7, wherein said moving means includes a fork for axially adjusting said clutch sleeve on said external shaft, and and operating shaft for operating said fork. 
     
     
       9. A drive according to claim 7, wherein said coupling means includes a worm wheel mounted on said external shaft, and a worm engaging said worm wheel. 
     
     
       10. A drive according to claim 7, further comprising function generators for indicating the rotational position of said internal and external cams.